jaw

1 jaw /ˈʤɑː/ noun
plural jaws
1 jaw
/ˈʤɑː/
noun
plural jaws
Britannica Dictionary definition of JAW
1 
[count]
a  : either one of the two bones of the face where teeth grow
— often used figuratively
— see picture at face
b  : the lower part of a person's face — usually singular
2 
jaws [plural] : two parts of a machine or tool that open and close to hold or crush something

jaw drops

◊ If your jaw drops, you open your mouth in a way that shows you are very surprised or shocked.
2 jaw /ˈʤɑː/ verb
jaws; jawed; jawing
2 jaw
/ˈʤɑː/
verb
jaws; jawed; jawing
Britannica Dictionary definition of JAW
[no object] informal
: to talk in an angry way or for a very long time